the three men , two women and four children were detained by soldiers at a checkpoint in ogulpinar .
it is believed the youngest of the four children is two and the eldest is 11 that were arrested trying to enter syria illegally .
over the past three months more than a dozen britons , including three teenage schoolgirls , have made the journey .
more than 22,000 foreign fighters are now believed to have joined islamic state from around 100 countries .